Automatic stop for phonographs



G. R. KNICK.

AUTOMATIC STOP FOR PH 0NOGRAPHS.' APPLICATION FILED sEPT.22, 1920.

1,403,038, Patented Jan. 10, 1922..

* gTiS- i Glenn B Kzzick.

GLENN R. KNIGK, OF TROY, OHIO.

A'ororaa'ri'o sror non rnonoennrns.

Specification of Letters Patent.

Patented Jan. 1Q, 1922.

Application filed September 22; 1920. SeriaI No. 412,002.

To all whom it may concern:

Be it known that I, GLENN R. Kmon, a citizen of the United States, residing at Troy, 1n the county of Miami, State of Ohio, have invented certain new and useful Improvements in Automatic Stops for Phonographs; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. i

This invention relates to new and useful improvements in stops or brakes and particularly to stops or brakes for phonographs.

The present device is especially adapted for use in connection with the mechanical movement which forms the subject-matter of my application filed February 17, 1920, Ser. No. 359,376, and whereby the said mechanical movement is rendered capable of operation by hand or automatically.

Another object is to provide a device of this character whereby the disk which con trols the movements of the brake arm into and out of engagement with the governor disk may be automatically moved into position to release the brake arm by means of the tone arm of the graphophone when the needle passes along the innermost groove of the record.

A further object is to provide a device which can be set for different records so that the needle, upon entering and passing through the last groove of the record, will cause the tone arm to engage with and operate the mechanism to apply the brake arm to the disk of the governor. I

Other objects and advantages will be ap parent from the following description when taken in connection with the accompanying drawings.

In the drawings:

Figure 1 is a bottom plan view of the motor board or top board of a graphophone showing the mechanism thereon.

Figure 2 is a side elevation of the motorboard, turntable, tone arm, and the mechanism of the invention applied thereto.

Figure 3 is a side elevation of the stopping and starting mechanism, the disk of the mechanism being in set position, or the position wherein the brake arm is held released from the governor.

Figure i is an enlarged vertical sectional view through the arm and bracket which hold the cam disk in set position, taken on the line H of Figure 1.

Referring particularly to the accompanymg drawings, 10 represents the top board of a phonograph box or cabinet, on the lower side of which is secured the motor 11, said motor, being properly geared to rotate the turntable 12. Mounted on the upper side of the .board 10 is the pivoted tone arm which carries the sound-box 13 and stylus 14. A vertical standard 15 is secured to the upper face of the board 10 and has its up per end forked, as at 15, in which the tone arm is adapted to be placed to support the same when not in use. Secured to the vertical part of the pivotal portion of the tone arm is an outwardly and downwardly ex tending arm 16, the purpose of which will presently appear. Disposed on the upper face of the board 10 and extending from a point adjacent the pivotal support of the tone arm 10, and extending past the turntable shaft 17, to the side of the board remote from the said support of the tone arm, is a lever 18, the same being pivoted to the board at a point intermediate its length, as shown at 19. The endof the lever 18, adjacent the tone arm support, is turned up wardly and horizontally in a direction toward: the tone arm support, as shown at 20, said portion 20 being so. arranged as to lie in the path of the arm 16, when the tone arm swings toward the center of the record. The outer end of the lever 18 is provided with an upturned handle 21 which is adapted to be grasped to swing the lever on its pivot and dispose the portion 20 in position to be engaged by the arm 16 sooner or later, according to the distance the innermost groove of a record is arranged from the center ofthe record.

Pivotally supported by the depending bracket 22, on the lower face of the board 10, is a lever 23, the inner end of Whlch is provided with a frictlon member 2% arranged in position to engage Wlth the periphery of the governor dlsk 25. PW- otally carried by the outer end of the lever 23 is a vertically disposed disk 26, in which is formed an opening 27 the lower wall of whichis formed with a vertically extending triangular projection 28, resulting in vtwo notches or recesses 29. for the play of the lateral pin 29' carried by. the depending arm 37 which is pivoted on the lower end of the vertical spring held plunger 30. This plunger extends upwardly through the board 10 and the center of a metal plate 31, and is arranged to be depressed by the finger of the operator, whereby the disk 26 will be rocked first in one direction and thenin the other. A spring is engaged around the pivot of the lever 23 and has its opposite disk 26, engages with the upper edge of the lever 23 and rocks the lever on its pivot so as to raise the friction element 24L out of contact with the governor disk 25, whereupon the motor will operate to rotate the turntable. Upon the plunger 30 being again depressed, the pin 29 will engage with the other inclined face of the projection 28 and rock'the disk 26 in the opposite direction, thus permitting the spring 23 to rock the lever 23 and engage its friction element24 with the disk 25, and stop the motor.

' Extending horizontally outward from one side of the bracket 22 is an arm 31, and pivotally mounted on the lower side of this arm is an arm 32. Formed vertically through the board 10, at a point between the bracket 22 and the tone arm support, is an opening 33. Pivotally connected to the inner end of the lever 18 is one end of a curved lever or link 34:, and pivotally connected to the other end of this link 34 is one end of a lever 35, said lever being ofiset intermediate its'length, as at 35, to permit the outer portion of the lever to pass through said opening 33, and extend in a direction toward the outer end of the arm 32, where it is pivotally connected to said end of the arm 32. The link 34,, the lever 35, and the arm 32 are so connected and ar-- ranged as to be moved upon the slightest touch of the portion 20 by the arm 16, so

that the arm 32, which in normal position is disposed with its outer edge face slightly inward of the corresponding edge face of the bracket arm 31 to permit the nose 36 of the disk 26 to engage beneath the edge of the arm 31, and remain in such position until the arm 32 is moved against said nose and pushes the nose from'beneath the arm 31 Upon release of the nose of the disk 26 from the arm 31, the disk moves upwardly until the upper edge of its body engages with the lever 32, while at the same time the spring 23' rocks the lever 23 and presses its friction element 24 intoengagement with the disk 2.5 of vthe governor, and 7 stops the motor. It will be understood that upon two successive depressions of the plunger 30 the disk 26 will bee rocked to disengage the friction element from the governor disk and reengage it therewith again, thus permitting the starting and stopping of the motor by hand,

By swinging the lever 18 on its pivot the offset end 20 can be disposed to be engaged by the arm 16 according to the posltlon of the tone arm when the stylus enters and passes along the last groove of the record, at the finish of the piece. The arm 32, and the links 3 and 35 are so arranged as to require but a very slight movement of the portion 20, by the arm 16, to push the nose of the disk 26 from the bracket arm 31,

thus stopping the rotation of the turntable and record almost instantly that the last tone of the record has been sounded, This prevents the stylus from scratching the face of the record, and also prevents the needle of the piece indistinct.

WVhat is claimed is: V

1. In an automatic stop for a graphephone, the combination with a governor disk and tone arm (are graphophone, of a lever pivotally mounted and spring urged into normal engagement with the governor disk, a member 'rockable on the lever, a detent for engagement by the rockable member at times to hold the lever out of engagement with the governor disk, an arm pivotally mounted on the detent in position to move the rockable member out of engagement with the detent, and means connected with the pivoted arm and actuated by the tone arm for releasing the rockable member,

bracket arm mounted for engagement by the disk, an arm pivotally mounted on the bracket arm in position to engage withthe disk and push the same from engagement with the bracket arm, a lever having an offset inner end, a curved link pivotally con nected to the offset end of the lever, a link pivotally connected to the curved link and to the pivoted arm, and an arm carried by and movable with the tone arm for engagement with the offset end of the-lever to 'move the pivoted arm and release the piv- GLENN, R. KNrc Witnesses:

F. V. FLINN, V ROBERT H. WHITE. 

